对象创建过程中的Java覆盖 [英] java override during object creation

问题描述

在下面的Java代码中，创建了一个JButton，但与此同时，其一个方法被覆盖. 问题:在创建对象时是否存在以这种方式覆盖的名称?

in the following java code a JButton is created but at the same time one of its methods gets overridden. Qestion: is there a name for overriding in this way while creating the object?

代码:

   JButton myButton;
   myButton = new JButton ("ok"){

        @Override
        public void setText(String text) {
            super.setText(text +", delete");
        }

jbutton的标签现在为确定，删除"

the jbutton's label is now "ok, delete"

推荐答案

这是一个匿名类.来自简而言之Java

That's an anonymous class. From Java in a Nutshell

匿名类是本地类 没有名字匿名课程是 一次定义和实例化 使用新的简洁表达 操作员.虽然是本地班 定义是一个语句块 Java代码，一个匿名类 定义是一个表达式，其中 意味着它可以作为一部分包含在内 较大的表达式，例如 方法调用.当本地课程是 仅使用一次，请考虑使用 匿名类语法，该语法将 类的定义和使用 完全一样的地方.

An anonymous class is a local class without a name. An anonymous class is defined and instantiated in a single succinct expression using the new operator. While a local class definition is a statement in a block of Java code, an anonymous class definition is an expression, which means that it can be included as part of a larger expression, such as a method call. When a local class is used only once, consider using anonymous class syntax, which places the definition and use of the class in exactly the same place.

这是在不通过class表达式显式定义新类的情况下提供基类特化的一种常用方法.

It's a common means of providing a specialisation of a base class without explicitly defining a new class via the class expression.

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